Abstract
Total forces due to linear gravity waves on a small circular tube randomly oriented with respect to the wave direction are investigated. A generalized Morison-type equation is written in terms of the components of water particle kinematics normal to the inclined tube. Two component normal forces on two small sections of a 3-inch tube at different orientations are measured in an experiment in a wave tank. The hydrodynamic coefficients, CsubM & CsubD are calculated by a least square fit to the measured in-line forces. The coefficients are shown to depend on the period parameter without large scatter. Total in-line forces on the tube are computed based on the mean CsubM and CsubD curves and are found to correlate satisfactorily with the corresponding total measured in-line forces. Total normal forces on the tube sections are shown to be substantially higher than the in-line forces at large period parameters due to the contribution of the lift force.
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